Implementation and Evaluation of a Spectroscopic System for Passive Near-Field Microscopy
Implementation and Evaluation of a Spectroscopic System for Passive Near-Field Microscopy
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DOI：
10.1109/lpt.2019.2924728
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发表时间：
2019-08-01
影响因子：
2.6
通讯作者：
Kajihara, Yusuke
中科院分区：
文献类型：
--
作者：
Sakuma, Ryoko;Lin, Kuan-Ting;Kajihara, Yusuke
长波长红外（LWIR）是对于化学键和分子运动的对应关系非常有吸引力的光谱。近年来，我们开发了一种被动长波红外散射型扫描近场光学显微镜（s-SNOM），无需任何外部光源即可检测由此类局部现象引入的表面波（波长：14.5μm），空间分辨率为20nm。在这里，我们报告了一种新开发的被动近场光谱系统，可以对 8 至 16 μm 范围内的可检测波长进行光谱测量。我们设计并构建了基于光栅的光学系统，并证明在可检测波长范围内的衍射效率超过 60%。这种新开发的光谱系统将有可能以 100 nm 的光谱分辨率区分不同波长的能量。
Long wavelength infrared (LWIR) is highly attractive spectra to the correspondence of chemical bonding and molecular motion. In recent years, we have developed a passive LWIR scattering-type scanning near-field optical microscopy (s-SNOM) that detects surface waves introduced by such local phenomena (wavelength: 14.5 mu m) with a spatial resolution of 20 nm without any external light sources. Here, we report a newly developed passive near-field spectroscopic system that allows a spectroscopic measurement of detectable wavelengths ranging from 8 to 16 mu m. We designed and built a grating-based optical system and proved to have a diffraction efficiency of more than 60% over the detectable wavelengths ranges. This newly developed spectroscopic system would have the potential to distinguish the energy of different wavelengths with a spectral resolution of 100 nm.